JPH029342Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-conditioning/heating-water supply apparatus in which a hot-water supply kit is added to an air-conditioning/heating apparatus having an outdoor unit and an indoor unit.

FIG. 1 shows an example of a conventional device. The solid arrows in the figure indicate during cooling, during cooling + hot water supply, during heating and defrosting,
The dotted arrow indicates the direction of refrigerant flow during hot water supply when the heating thermometer is turned off during heating.

Outdoor unit A includes a refrigerant compressor 1 serving as a heating and cooling source, a four-way valve 2, a heat source side heat exchanger 3, a pressure reducer 4,
Check valve 5, accumulator 9, outdoor blower 21
is built-in.

The indoor unit B includes a pressure reducer 6, a user-side heat exchanger 8, an indoor blower 22, and an auxiliary electric heater 24.

The hot water supply kit C includes a hot water heat exchanger 10, a hot water pump 11, and a liquid receiver 23. 12 is a hot water storage tank, 19 is a water supply pipe, and 20 is a hot water supply pipe.

Outdoor unit A and indoor unit B have refrigerant piping 1
6, outdoor unit A and hot water supply kit C are connected by refrigerant pipes 13, 14, and 15-1, indoor unit B and hot water supply kit C are connected by refrigerant pipe 15-2, and hot water supply kit C and hot water storage tank 12 are connected by refrigerant pipe 15-2. is water pipe 1
They are connected by 7 and 18. The hot water supply pump 11 is stopped during cooling, heating and defrosting, and heating, and operates during cooling and hot water supply, hot water supply when the heating thermometer is turned off, and hot water supply. The indoor blower 22 is a heating thermostat
When hot water is supplied when OFF, the rotation is slow (breeze operation),
The outdoor blower 21 is stopped only during heating and defrosting, and is operated at other times.

Each operation mode in such a device is as follows.

During cooling, the pump 11 is off, and the high-temperature, high-pressure gas refrigerant discharged by the compressor 1 is transferred to the hot water heat exchanger 1.
0, it is cooled in the heat source side heat exchanger 3 and becomes a high-pressure liquid refrigerant, passes through the liquid receiver 23, is decompressed in the pressure reducer 6, evaporates in the usage side heat exchanger 8, becomes a low-pressure gas refrigerant, and returns to the compressor 1. At this time, the air passing through the user-side heat exchanger 8 is cooled and air-conditioned.

During cooling and hot water supply, the pump 11 is turned on.
Then, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is cooled by exchanging heat with hot water in the hot water heat exchanger 10. At this time, the hot water is heated. Thereafter, the refrigerant leaving the hot water heat exchanger 10 performs the same function as during cooling.

During defrosting operation, the operation is exactly the same as during cooling.

During heating, the pump 11 is turned off. The high-temperature, high-pressure gas refrigerant discharged by the compressor 1 passes through the hot water supply heat exchanger 10 and radiates heat in the user-side heat exchanger 8, becoming a high-pressure liquid refrigerant. At this time, the air passing through the user-side heat exchanger 8 is heated to perform heating. The refrigerant exiting the user-side heat exchanger 8 is decompressed by the pressure reducers 6 and 4, evaporated by the heat source-side heat exchanger 3, and returned to the compressor 1.

During hot water supply when the heating thermometer is off, the pump 11 is turned on and the high temperature, high pressure gas refrigerant discharged by the compressor 1 exchanges heat with hot water in the hot water heat exchanger 10 and is cooled. At this time, the hot water is heated in reverse, and the refrigerant leaving the hot water heat exchanger 10 performs the same function as during heating, but the indoor fan 22 rotates slower (breezes) than during heating.

When hot water is supplied, the same effect as when hot water is supplied when the heating thermometer is turned off is performed, but the indoor blower 22 is stopped.

Such conventional devices have the following drawbacks.

(1) During cooling or heating, the pump 11 is off and hot water is not flowing, but the high-temperature, high-pressure gas refrigerant discharged by the compressor 1 passes through the hot water heat exchanger 10.
The discharge pressure increases due to the pressure loss of the refrigerant, the cooling or heating capacity decreases, the power consumption of the compressor 1 increases, and the coefficient of performance (capacity/power consumption) decreases. Furthermore, since the operating value of the high pressure switch for stopping the compressor 1 is constant when the discharge pressure exceeds a predetermined value, the operating range of air conditions etc. becomes narrow.

(2) In order to add hot water supply function by attaching hot water supply unit C to an air conditioning system consisting only of outdoor unit A and indoor unit B, it is necessary to connect compressor 1 and four-way valve 2 with refrigerant piping. It is necessary to perform repair work to cut the refrigerant pipes and take out the refrigerant pipes 13 and 14 outside of the outdoor unit A, which increases equipment costs.

(3) When supplying hot water and when supplying hot water when the heating thermometer is turned off,
The refrigerant piping 16 and the user-side heat exchanger 8, and the heat source-side heat exchanger 3 and the refrigerant piping 15 during cooling and hot water supply
-1 and 15-2 are each sealed with refrigerant or in a liquid-gas mixed state, so the required amount of refrigerant to be filled into the circuit increases, so it is necessary to increase the size of the accumulator 9 and liquid receiver 23. This increases costs.

The present invention was developed with the aim of eliminating the above-mentioned drawbacks, and has the following features.

(1) Connect the high pressure liquid refrigerant piping and gas refrigerant piping connecting outdoor unit A and indoor unit B to hot water heat exchanger 1.
0, check valves 25 and 26 are connected via a solenoid valve 29.

(2) A high-pressure liquid refrigerant pipe connecting outdoor unit A and indoor unit B and a refrigerant pipe connecting the hot water heat exchanger are branched from the middle and connected to a low-pressure check joint 33 via a capillary 32, a liquid reservoir 31, and a solenoid valve 30. Connect (3) High-pressure liquid refrigerant that branches off from the middle of the gas refrigerant pipe that connects outdoor unit A and indoor unit B and the refrigerant pipe that connects the hot water heat exchanger and connects outdoor unit A and indoor unit B via check valve 41. Connecting to piping (4) The solenoid valve in the refrigerant piping in hot water supply kit C opens and closes depending on the purpose of operation. The liquid reservoir 31 is used to correct the difference in refrigerant amount due to differences in operation, and the capillary 3
2 is for adjusting the refrigerant flow rate of the liquid bypass.

An embodiment of the present invention will be described in detail below with reference to FIG. Note that in FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals, and therefore the description of those parts will be omitted.

Now, 25, 26, 2 shown in Figure 2
7, 41 are check valves, 28, 29, 30 are electromagnetic valves, 31 is a liquid reservoir, 32 is a refrigerant adjustment capillary for preventing overheating, 33 is a check joint, 34-
1 to 34-4, 35-1 to 35-3, 3
6-1, 36-2, 37-1, 37-2, 38-
1, 38-2, 39-1, 39-2, 40-1 to 40-5 are refrigerant pipes, respectively.

Outdoor unit A and indoor unit B are known air-conditioning devices. Outdoor unit A and indoor unit B
High pressure liquid refrigerant piping 34-1, -2, -3, -4 connecting
midway 34-3 and gas refrigerant pipes 35-1, -2, -
3, the refrigerant pipes 39-1, -2, 37-1, -2, 38-
Connect with 1, -2. The refrigerant pipe 39 includes a check valve 26,
The refrigerant pipes 37-1 and -2 are provided with a check valve 25, and the refrigerant pipe 38 is provided with a solenoid valve 29. Refrigerant piping 3
There is a solenoid valve 28 between 4-2 and 34-3, and a check valve 27 is provided in a circuit that bypasses it.

A refrigerant pipe 36- is branched from the refrigerant pipe 34-2.
1 and -2, and the refrigerant pipe 37 is connected through the check valve 41.
-2,38-1.

A refrigerant pipe 40- is branched from the refrigerant pipe 39-1.
1, -2, -3, -4, -5 are connected to the check joint 33 of the suction line. On the way, there is a refrigerant amount adjustment capillary 32 for overheating prevention, a liquid reservoir 31, and a solenoid valve 30.
is provided.

In Fig. 2, the arrow → indicates the direction of refrigerant flow during cooling and heating and defrosting, the arrow indicates the direction of cooling and hot water supply, the arrow 〓 indicates the heating, and the arrow 〓 indicates the flow direction of the refrigerant during hot water supply and hot water supply when the heating thermometer is turned off. There is. next~
The effects of each operation mode will be explained.

During cooling (arrow → solenoid valve 28, 30 open solenoid valve 2
9 closed pump 11 off) The high temperature and high pressure gas refrigerant discharged by the compressor 1 passes through the four-way valve 2 and is cooled by the heat source side heat exchanger 3 to become liquid refrigerant.
After passing through the refrigerant pipes 34-1 and -2, the electromagnetic valve 28, and the refrigerant pipes 34-3 and -4, the pressure is reduced in the pressure reducer 6, and then evaporated in the use-side heat exchanger 8. After that, the refrigerant pipe 35
-1, -2, -3 and return to compressor 1. At this time, the air passing through the user-side heat exchanger 8 is cooled and air-conditioned.

Since the electromagnetic valve 30 is open, the pressure inside the hot water heat exchanger 10, the liquid reservoir 31 and the refrigerant pipes 40-1 to 40-5 becomes low, and there is no liquid refrigerant, resulting in a low-pressure gas state.

During heating and defrosting, the operation is the same as during cooling except that the outdoor blower 21 is stopped, the indoor blower 22 is stopped, or there is a slight breeze (slow rotation).

During cooling + hot water supply (arrow solenoid valve 29 is open, solenoid valve 28 is closed, pump 11 is on, outdoor blower 21 is stopped to reduce the amount of heat exchange, or the rotation speed is slowed down, or if there are multiple units, the number of units in operation is reduced) (The solenoid valve 30 opens and closes by detecting the temperature with a detection end (thermo) attached to the discharge pipe or the housing of the compressor 1.) The high temperature and high pressure gas refrigerant discharged by the compressor 1 is transferred from the four-way valve 2 to the heat source. Enters side heat exchanger 3. The amount of heat exchange here is small. Check valve 5, refrigerant pipe 34
-1,36-1, check valve 41, refrigerant pipe 36-
2, 38-1, solenoid valve 29, refrigerant pipe 38-2
The water then enters the hot water heat exchanger 10. Here, the refrigerant is cooled and becomes a liquid refrigerant through the refrigerant pipe 39-1, the check valve 26, and the refrigerant pipes 39-2, 34-3, and 4, and thereafter performs the same function as during cooling. pump 1
1 is on, hot water is heated in the hot water heat exchanger 10. The pump 11 operates until the water temperature in the hot water storage tank 12 reaches a predetermined temperature. If the cooling load is large and the refrigerant temperature rises, resulting in overheating operation, the pump 11 detects the temperature of the discharge pipe or the housing of the compressor 1, etc. Then, the solenoid valve 30 is opened to bypass the liquid to the low pressure side. An adjustment capillary 32 is provided to prevent liquid refrigerant from returning too much.

During heating (arrow = solenoid valve 30 open, 38, 39
closed, pump 11 off) The high temperature and high pressure gas discharged by the compressor 1 is cooled through the four-way valve 2 and the refrigerant pipes 35-3, 35-2, 35.
-1, it is cooled by the user-side heat exchanger 8 and becomes a liquid refrigerant. The air passing through the user-side heat exchanger 8 is heated and provides room heating. The refrigerant that has exited the user-side heat exchanger 8 is transferred to the pressure reducer 6, the refrigerant pipes 34-4, 34-3, the check valve 27, the refrigerant pipes 34-2, 34-1, and the pressure reducer 4.
After the pressure is reduced, the water is evaporated in the heat exchanger 3 on the heat source side and returned to the compressor 1. As in the case of cooling, the electromagnetic valve 30 is open, so the inside of the hot water heat exchanger 10 and the liquid reservoir 31 are in a low pressure gas state.

When supplying hot water, when heating thermometer is off, when supplying hot water (arrow = solenoid valve 29 open, 28 closed, pump 11 on,
The indoor blower 22 stops when supplying hot water, the rotation speed is slow (breeze) when supplying hot water when the heating thermometer is off, and the solenoid valve 30 opens in case of overheating operation (same as cooling + hot water supply) High-temperature, high-pressure gas discharged by the compressor 1 The refrigerant passes through a four-way valve 2, a refrigerant pipe 35-3, and one refrigerant pipe 37-1, a check valve 25, a refrigerant pipe 37-2,
38-1, solenoid valve 29, refrigerant pipe 38-2, cooled by hot water heat exchanger 10 and becomes liquid refrigerant, refrigerant pipe 39-1, check valve 26, refrigerant pipe 39-
2 to the refrigerant pipe 34-3 (hot water is heated in the hot water heat exchanger 10 and the pump 11 is operated until the water temperature in the hot water storage tank 12 reaches a predetermined temperature), and the other refrigerant pipe 35-2,
Passing through 35-1, the user side heat exchanger 8, pressure reducer 6,
What passes through the refrigerant pipe 34-4 is the refrigerant pipe 34-
Join at 3. The latter refrigerant flow rate is smaller than the refrigerant flow rate passing through the hot water heat exchanger 10 due to large piping resistance. The refrigerant that has exited the refrigerant pipe 34-3 has the same effect as during heating.

Hot water supply operation is carried out even in midsummer conditions. The refrigerant circuit has a heavy load because it uses a heating circuit (the evaporator is outside), and the refrigerant temperature rises, making overheating inevitable. For this purpose, a liquid bypass circuit is provided that detects the temperature of the discharge pipe or the housing of the compressor 1 and opens and closes the solenoid valve 30.
This effect is the same as in the case of cooling + hot water supply. When the solenoid valve 30 is closed, the liquid reservoir 31 is full.

The liquid reservoir 31 has a size that compensates for the difference in the amount of refrigerant required during cooling/heating and hot water supply.

The air-conditioning, heating, and hot-water supply apparatus of the present invention as described in detail above has the following effects.

(1) The amount of refrigerant in the device is almost the same as that of a standard air conditioner without a hot water supply kit, and the accumulator 9 can be used as is in the standard device.

(2) During cooling and heating, the hot water heat exchanger 10 is bypassed, so the capacity, operating point, etc. are the same as standard air conditioners.

(3) Hot water supply kit C is installed between the refrigerant pipes 34 and 35 connecting outdoor unit A and indoor unit B, so it is also connected to a liquid bypass circuit (or a relief pipe to low pressure).
Since the check joint of outdoor unit A is used, there is no need to modify outdoor unit A and indoor unit B by adding hot water supply kit C, which reduces equipment costs.

[Brief explanation of drawings]

Figure 1 is a system diagram showing a conventional air conditioning, heating, and hot water supply system.
FIG. 2 is a system diagram showing an embodiment of the air-conditioning/heating/hot water supply device according to the present invention. A...Outdoor unit, B...Indoor unit, C
...Hot water supply kit, 1...Compressor, 2...Four-way valve,
3... Heat source side heat exchanger, 8... User side heat exchanger,
10...Hot water heat exchanger, 11...Hot water pump, 2
5, 26, 27, 41...Check valve, 28, 29,
30... Solenoid valve, 31... Liquid reservoir, 32... Refrigerant adjustment capillary for overheating prevention.

Claims (1)

[Scope of utility model registration request] Piping connects an outdoor unit that has a refrigerant compressor and a heat exchanger on the heat source side that serve as the cooling and heating source, and an indoor unit that has a heat exchanger on the user side that blows cold and hot air into the room based on the refrigerant supplied from the outdoor unit. In the air-conditioning and hot-water supply system in which a hot water supply kit having a hot water heat exchanger is added to the air-conditioning and heating system, the hot water supply kit includes a high-pressure liquid refrigerant pipe installed in series to connect the outdoor unit and the indoor unit. a first solenoid valve, a first check valve provided to bypass the first solenoid valve, a branch pipe of a gas refrigerant pipe connecting the outdoor unit and the indoor unit, and the hot water heat exchanger. a second check valve and a second solenoid valve connected in series between the refrigerant inlet of the water heater and the high pressure liquid refrigerant pipe on the indoor unit side; and a fourth check valve connected in series between the connection intermediate portion of the second check valve and the second solenoid valve and the high pressure liquid refrigerant pipe on the outdoor unit side. a check valve, a refrigerant amount adjustment capillary connected in series between the refrigerant outlet of the hot water supply heat exchanger and the refrigerant inlet side of the compressor of the outdoor unit, and a third solenoid valve; and a liquid reservoir provided at the intermediate portion of the connection with the third solenoid valve,
The first solenoid valve opens during cooling, the second solenoid valve opens during hot water supply and cooling + hot water supply, and the third solenoid valve opens during cooling, heating, hot water supply, and overheating during cooling + hot water supply. An air-conditioning, heating, and water-heating device that is controlled so that it sometimes closes.